190-01115-01
G3X/G3X Touch Installation Manual - LRU Pinouts
Rev. AC
Page 25-67
25.14.5 Discrete I/O
25.14.5.1 Discrete Inputs
The GSU 73 has 4 configurable discrete inputs.
When configured as Active Low, the inputs conform to the following specification:
ACTIVE: Vin < 3.5 VDC, or Rin < 375
Ω
INACTIVE: Vin > 8 VDC, or Rin > 100k
Ω
When configured as Active High, the inputs conform to the following specification:
ACTIVE: Vin > 8 VDC, or Rin > 100k
Ω
INACTIVE: Vin < 3.5 VDC, or Rin < 375
Ω
25.14.5.2 Discrete Outputs
The GSU 73 has 2 annunciator outputs, these outputs do not require any configuration and can be
optionally wired to an external annunciator. Discrete Out 1 acts as a master warning annunciator and is
active any time a warning CAS message (Red Alert) is displayed on the PFD. Discrete Out 2 acts as a
master caution annunciator and is active any time a caution CAS message (Yellow Alert) is displayed on
the PFD. Reference
DISCRETE OUT 1 is "master warning" - goes low when a red (warning) CAS alert is active.
DISCRETE OUT 2 is "master caution" - goes low when a yellow (caution) CAS alert is active.
The two states of these outputs are as follows:
INACTIVE: Floating (can be pulled up to externally sourced Vout in the range 0
≤
Vout
≤
33 VDC)
Leakage current in the INACTIVE state is typically
≤
10 uA to ground
ACTIVE: Vout
≤
0.5 VDC with
≤
20 mA sink current
Sink current must be externally limited to 20 mA max
Pin
Connector
Pin Name
I/O
9
J731
DISCRETE IN* 1
IN
10
J731
DISCRETE IN* 2
IN
11
J731
DISCRETE IN* 3
IN
12
J731
DISCRETE IN* 4
IN
*Indicates Active Low
Pin
Connector
Pin Name
I/O
13
J731
DISCRETE OUT* 1
OUT
14
J731
DISCRETE OUT* 2
OUT
*Indicates Active Low
